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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
Investigating molecular charge transfer complexes with a low temperature scanning tunneling microscope
F Jäckel1, U G E Perera, V Iancu
1Ohio University, Physics & Astronomy Department, Athens, Ohio 45701, USA.
Physical Review Letters
|June 4, 2008
Summary
Researchers studied molecular charge transfer complexes (CTCs) of alpha-sexithiophene (6T) and tetrafluoro-tetracyano-quinodimethane (F4TCNQ). They observed conductance switching in F4TCNQ within CTCs, suggesting potential for new molecular devices.
Area of Science:
- Surface Science
- Molecular Electronics
- Organic Chemistry
Background:
- Alpha-sexithiophene (6T) and tetrafluoro-tetracyano-quinodimethane (F4TCNQ) are key organic semiconductors.
- Molecular charge transfer complexes (CTCs) exhibit unique electronic properties.
- Understanding CTC formation on surfaces is crucial for molecular device development.
Purpose of the Study:
- Investigate the electronic structure of 6T:F4TCNQ CTCs on Au(111).
- Explore the charge distribution within the hybrid molecular orbitals of the CTCs.
- Examine the conductance switching behavior of F4TCNQ within these complexes.
Main Methods:
- Scanning tunneling microscopy (STM)
- Scanning tunneling spectroscopy (STS)
- Spectroscopic imaging at cryogenic temperatures (6 K)
Main Results:
- Formation of new hybrid molecular orbitals in 6T:F4TCNQ CTCs.
- Localization of the highest occupied molecular orbital (HOMO) on F4TCNQ and the lowest unoccupied molecular orbital (LUMO) on 6T.
- Observation of conductance switching of F4TCNQ within the CTCs.
Conclusions:
- 6T:F4TCNQ CTCs on Au(111) exhibit distinct electronic structures with charge transfer.
- The observed conductance switching of F4TCNQ presents opportunities for molecular electronics.
- These findings pave the way for novel molecular device applications.
